PHP mysqli: prepare() function
mysqli_prepare function / mysqli::prepare
The mysqli_prepare function / mysqli::prepare — Prepare an SQL statement for execution.
Syntax:
Object oriented style
mysqli_stmt mysqli::prepare ( string $query )
Procedural style
mysqli_stmt mysqli_prepare ( mysqli $link , string $query )
Parameter:
| Name | Description | Required/Optional |
|---|---|---|
| link | A link identifier returned by mysqli_connect() or mysqli_init() | Required for procedural style only and Optional for Object oriented style |
| query | The query, as a string. | Required |
Usage: Procedural style
mysqli_prepare ( string $query );
Return value:
mysqli_prepare() returns a statement object or FALSE if an error occurred.
Version: PHP 5, PHP 7
Example of object oriented style:
<?php
$mysqli = new mysqli("localhost", "user1", "datasoft123", "hr");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$city = "Mumbai";
/* create a prepared statement */
if ($stmt = $mysqli->prepare("SELECT District FROM City WHERE Name=?")) {
/* bind parameters for markers */
$stmt->bind_param("s", $city);
/* execute query */
$stmt->execute();
/* bind result variables */
$stmt->bind_result($district);
/* fetch value */
$stmt->fetch();
printf("%s is in district %s\n", $city, $district);
/* close statement */
$stmt->close();
}
/* close connection */
$mysqli->close();
?>
Example of procedural style:
<?php
$link = mysqli_connect("localhost", "user123", "datasoft123", "hr");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$city = "Mumbai";
/* create a prepared statement */
if ($stmt = mysqli_prepare($link, "SELECT District FROM City WHERE Name=?")) {
/* bind parameters for markers */
mysqli_stmt_bind_param($stmt, "s", $city);
/* execute query */
mysqli_stmt_execute($stmt);
/* bind result variables */
mysqli_stmt_bind_result($stmt, $district);
/* fetch value */
mysqli_stmt_fetch($stmt);
printf("%s is in district %s\n", $city, $district);
/* close statement */
mysqli_stmt_close($stmt);
}
/* close connection */
mysqli_close($link);
?>
Output:
Amersfoort is in district Utrecht
<?php
$con = new mysqli("localhost", "user1", "datasoft123", "hr");
$stmt = $con->prepare("SELECT * FROM employees WHERE LAST_NAME = ?");
$stmt->bind_param("s", $_POST['last_name']);
$stmt->execute();
$result = $stmt->get_result();
if($result->num_rows === 0) exit('No rows');
while($row = $result->fetch_assoc()) {
$id[] = $row['EMPLOYEE_ID'];
$name[] = $row['FIRST_NAME'];
$age[] = $row['LAST_NAME'];
}
$stmt->close();
?>
Output:
EMPLOYEE_ID FIRST_NAME LAST_NAME EMAIL PHONE_NUMBER HIRE_DATE JOB_ID SALARY COMMISSION_PCT MANAGER_ID DEPARTMENT_ID
156 Janette King JKING 011.44.1345.429268 1987-08-12 SA_REP 10000.00 0.35 146 80
100 Steven King SKING 515.123.4567 1987-06-17 AD_PRES 24000.00 0.00 0 90
See also